ASTM D2789 Test Method for Hydrocarbon Types in Low Olefinic Gasoline by Mass Spectrometry
6. Apparatus
6.1 Mass Spectrometer - Any mass spectrometer that passes the performance test described in Section 8.
NOTE 1 - Calibration and precision data for this method were obtained on Consolidated Electrodynamics Corp. Type 21-101, 21-102, and 21-103 mass spectrometers. These instruments operated with an ion source temperature at or near 250°C and at a constant magnetic field of about 3100 to 3500 gauss. Laboratories using either Consolidated Electrodynamics Corp. mass spectrometers that operate with different parameters or instruments other than this design should check the applicability of the calibration data in Table 1. If necessary, individual laboratories should develop their own calibration data using the blends described in Table 2.
6.2 Sample Inlet System - Any sample inlet system that allows the introduction of the text mixture (8.2) without loss, contamination, or change of composition.
NOTE 2 - Laboratory testing has shown that, unless a special sampling technique or a heated inlet system is used, relatively large errors will occur in the determination of small quantities of indans, tetralins, and naphthalenes.
6.3 Manometer - A manometer suitable for direct reading in the 0 to 100-mtorr (0 to 13-Pa) range is optional.
NOTE 3 - The expression mtorr as used in this procedure replaces the older µ (micron) unit of pressure.
6.4 Microburet or Constant-Volume Pipet.
